Malicious PDF — malware analysis report

Static analysis result for SHA-256 5872937d27eba275…

MALICIOUS

PDF

87.7 KB Created: 2021-07-03 12:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6e9d49580bbed44312c64c2f3e58f85e SHA-1: 83efbc87281ccb9b57ee2718f2e58f833a793d00 SHA-256: 5872937d27eba275d51b6ab9d4f1fd930b44bab68748633af78b2cc043a0b7fd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm on compromised WordPress sites and uses SEO poisoning to lure victims with search terms like 'cbse 10th board exam previous year question papers'. The presence of a 'Download Now' lure further supports a phishing or scamming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://alshamiltrading.com/alshamilfiles/file/52959839921.pdf In PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca3c2894a6---6540847747.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/21823606748.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/buripokelokakof.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/7c3237b623822e15156f3ef3f0ffc6dd/danuvun.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/c6d2185a332870c1f63e98663b787a83/wupaxilidisabeb.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/6a65f0903e3bd699d12bb6507051910b/dutite.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fc15e55be---nerifez.pdfIn PDF document text
    • https://citytrafik.nu/images/file/loxizokubotar.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/venaxogalopa.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/81911844605.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/15902699833.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/vewimufuwivutejebig.pdfIn PDF document text
    • https://windsbs.biz/files/file/mugoteworixijolegiwiped.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/2c605dc4dc1018089807b8ec29210ab7/4384620288.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/d3301b4357488e98e0a379f500eb7a77/dubirelodeparekemoxaxax.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/a173f79cccec85dda9c806027eb46ede/42370463456.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d82de477e44---43422946071.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c619cca0527---topaketosimag.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/90196807668.pdfIn PDF document text
    • http://evola.it/userfiles/files/38161109563.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b435a51d7cc---17627473617.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/63940696439.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/zabowovo.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/rexopogogevavave.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/791f5edd74d7212304b3c6c41dd55716/39650917291.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/kamewipekerajuxugov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=cbse+10th+board+exam+previous+year+question+papers+with+answers+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10700 16880 bytes
SHA-256: 31e68d98af8240c24979b97200074d7bfdcece1fe9a724db6148987cd10ec75f
font_02_sfnt_off00013329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13329 11676 bytes
SHA-256: 7c476e70031ba9d50e944a15043820b30bd5d5f344572dd4ec25dda996e5e287

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